If you look at the left where the metal is about to be pushed in the chain (like at the bolt while it's still in the thing that pushes it into the rest of the chain), it stutters a bit. Almost perfect. Almost.

If you watch the source video that "stutter" is from when the metal gets cut right before it gets pushed through the previous link and bent. This gif shows what I'm talking about i.imgflip.com/xqljr.gif (click to show) . However if you look at the left roller it does stutter a little so still almost perfect.

Notice the blackened area (center bottom) I think this is from the heat of the weld on each link as it drops down. Also this would be why the link turns 45° clockwise at that stage... thanks.. I really liked this.